Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c55477e08bbad98…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 05:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7dc3685e65f53f13450cba9db2115f5 SHA-1: 57c6fd77fce1b0de79c6a93fe2f25ec6036723e1 SHA-256: 6c55477e08bbad98c33bd49cb257a4132fc023348d38199b38356754f85b2fe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this file as a link farm designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a5aa1cb8---kigafigasodixe.pdf In PDF document text
    • http://df-2.de/images/daten/file/18038369062.pdfIn PDF document text
    • http://matras-devison.com/upload/file/sikekabu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612019919b46d---61346600277.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/78309752789.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/nuwifuzirofadilodileji.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ircnf27kt6fk8i5cp4ukmqre65/gezatifafujupuwoguza.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/63857815864.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/80946447662.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/m0nsdll5gepvvk10098jmaamp2/1420940599.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/libirave.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/girinagu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c1e5c576c---milidonaduxuwevazok.pdfIn PDF document text
    • http://fgosvo.ru/files/files/tisoju.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/vuxupidibegajataruvokaw.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d7b442cad110dcbf7c2367d16ac71ab5/petijitepixuf.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/fuwujabiteduvuwisikizuni.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7656179418---duverezufomanekinobo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14cff03c7---welepukutusuzesaw.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/bixivuna.pdfIn PDF document text
    • http://ellev.fr/upload/files/80125650187.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/b8hhuh3ullrg67jelcsjbj3utt/32666943727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=synscan+az+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 18872 bytes
SHA-256: be106e421f7863eb99c032a648ee136def38523739165b44ecafe7eb8f9754c7
font_01_sfnt_off00010d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 10200 bytes
SHA-256: 37f49d199819941b23c081e663fd661c946640f160b44679aae88c66342b3fdb
font_02_sfnt_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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